Keystones — Lintel
Five GCSE retrieval questions · 1 February 2026 · mathsvault.uk/keystones
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1. Number Error intervals
77 is rounded to the nearest integer. What is the error interval?
Answer: 76.5 ≤ x < 77.5 -
2. Algebra Expanding two brackets
Expand: (x - 6)(x - 2)
Answer: x² - 8x + 12 -
3. Geometry Area of a circle
A circle has area 380.cm². Find its radius (dp)
Answer: 11cm -
4. Ratio One amount as a percentage of another
36 out of 90 students passed. What percentage passed?
Answer: 40% -
5. Statistics Averages and range
Find the mean, median and range of: 32, 52, 75, 97, 50, 94, 89, 34
Answer: Mean = 65.4, Median = 75, Range = 65